Case cover, case assembly, battery pack, and electric device

Abstract

The utility model provides a kind of box cover, shell assembly, battery pack and electric equipment, box cover includes cover plate, the cover plate includes honeycomb core layer, first structure layer and second structure layer, the first structure layer and the second structure layer are respectively arranged in the opposite sides of the honeycomb core layer;Wherein, the first structure layer includes non-metallic base reinforced composite material layer;And / or, the second structure layer includes non-metallic base reinforced composite material layer.The cover plate of box cover is composed of honeycomb core layer and the first structure layer and the second structure layer of its two sides by sandwich structure, at least one of first structure layer and second structure layer includes non-metallic base reinforced composite material layer, while realizing the lightweight of box cover, improve bending stiffness and torsional properties, give consideration to structural strength requirement, to improve its structural safety and performance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cover, a housing assembly, a battery pack, and electrical equipment. Background Technology

[0002] Battery packs are key components in electrical equipment such as new energy vehicles, and their housing assemblies typically include a casing and a cover. The cover not only seals and protects the battery modules but also needs sufficient structural strength to withstand various mechanical loads generated during vehicle operation.

[0003] Currently, battery pack covers are mostly made of metal materials such as aluminum alloy or steel. While these materials offer high strength and rigidity, their high density results in a relatively heavy overall weight, which is detrimental to improving the energy density of the battery system. On the other hand, while some covers using non-metallic reinforced composite materials achieve weight reduction, they suffer from insufficient rigidity. In practical use, this lack of rigidity can cause the cover to twist and deform under vibration or external forces, affecting its structural safety (such as causing sealing failure, structural interference, or even mechanical damage) and performance (e.g., abnormal noises due to localized swaying or resonance, reducing the overall NVH quality of the vehicle, and impacting user experience and long-term reliability). Utility Model Content

[0004] The embodiments of this utility model provide a box cover, a housing assembly, a battery pack, and an electrical device. While achieving lightweighting of the box cover, it improves bending stiffness and torsional performance, while taking into account structural strength requirements, thereby improving its structural safety and performance, and at least partially solving the above-mentioned technical problems.

[0005] In a first aspect, embodiments of the present invention provide a box cover, including a cover plate, the cover plate comprising:

[0006] Honeycomb core layer;

[0007] A first structural layer and a second structural layer are respectively disposed on opposite sides of the honeycomb core layer;

[0008] Wherein, the first structural layer includes a non-metallic matrix reinforced composite material layer; and / or, the second structural layer includes a non-metallic matrix reinforced composite material layer.

[0009] In one embodiment, the cover plate further includes a first fireproof layer disposed on the side of the first structural layer opposite to the honeycomb core layer.

[0010] In one embodiment, the cover plate further includes an electromagnetic shielding layer disposed between the first fireproof layer and the first structural layer.

[0011] In one embodiment, the cover plate further includes a second fireproof layer disposed on the side of the second structural layer opposite to the honeycomb core layer.

[0012] In one embodiment, the cover plate further includes an electromagnetic shielding layer.

[0013] The electromagnetic shielding layer is disposed between the second fireproof layer and the second structural layer; or...

[0014] The electromagnetic shielding layer is disposed on the side of the second fireproof layer away from the second structural layer, and the electromagnetic shielding layer is directed toward the battery module.

[0015] In one embodiment, the cover plate further includes a phase change material disposed in the cavity structure of the honeycomb core layer.

[0016] In one embodiment, the cover plate further includes an encapsulation shell that encapsulates the phase change material to form phase change material microcapsules, which are disposed in the cavity structure of the honeycomb core layer.

[0017] In one embodiment, the non-metallic reinforced composite material layer comprises a resin-based continuous fiber reinforced composite material layer.

[0018] Secondly, embodiments of the present invention provide a housing assembly, comprising:

[0019] The box has an opening;

[0020] The cover as described in any of the above claims is disposed over the opening to define, together with the housing, a mounting cavity for mounting the battery module.

[0021] In one embodiment, the cover plate includes a main plate and a side plate. The main plate is disposed on the side of the box body where the opening is provided and is spaced apart from the box body. The side plate is bent and connected to the periphery of the main plate.

[0022] The lid also includes an eaves panel, which is bent and connected to the side panel at the end away from the main body panel and extends toward the center away from the main body panel. The end of the eaves panel away from the side panel is connected to the box body to close the opening.

[0023] In one embodiment, the side plate includes a first part and a second part that are bent together;

[0024] The main body plate includes a main body portion and a corner portion. A portion of the periphery of the corner portion is connected to the first part and the first part, and a portion of the periphery of the corner portion is connected to the main body portion. The thickness of the corner portion is greater than the thickness of the main body portion.

[0025] In one embodiment, the main body plate has a partial protrusion on one side facing the housing to form a reinforcing rib.

[0026] In one embodiment, the reinforcing rib includes a first reinforcing rib and a second reinforcing rib, the extension directions of the first reinforcing rib and the second reinforcing rib intersect.

[0027] In one embodiment, the two ends of the first reinforcing rib extend to the periphery of the main body plate, respectively;

[0028] One end of the second reinforcing rib extends to the periphery of the main body plate.

[0029] Thirdly, embodiments of the present invention provide a battery pack, comprising:

[0030] Housing assembly as described in any of the above;

[0031] The battery module is installed in the mounting cavity.

[0032] Fourthly, embodiments of this utility model provide an electrical device including the battery pack described above.

[0033] The beneficial effects of the embodiments of this utility model are as follows:

[0034] In an embodiment of this utility model, the cover plate of the box lid is composed of a honeycomb core layer and a first structural layer and a second structural layer disposed on both sides thereon, forming a sandwich structure. The first and second structural layers serve as the surface layers of the sandwich structure, and at least one of them includes a non-metallic matrix reinforced composite material layer, which is characterized by high strength and lightweight, primarily used to withstand in-plane tensile, compressive, and shear loads, and bears the main bending moment in the overall structure. The honeycomb core layer in the middle has a high porosity, which not only significantly reduces the overall weight of the box lid but also provides excellent bending stiffness and lateral shear bearing capacity. Through the above structural design, while achieving lightweighting of the box lid, the bending stiffness and torsional performance are improved, taking into account structural strength requirements, thereby enhancing its structural safety and performance. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a three-dimensional structural diagram of the box lid provided in an embodiment of this utility model;

[0037] Figure 2 yes Figure 1A three-dimensional structural diagram of the box lid from another perspective;

[0038] Figure 3 yes Figure 1 A schematic diagram of the layered structure of the lid of the box.

[0039] Figure 4 yes Figure 1 A schematic diagram of another layered structure of the lid of the box;

[0040] Figure 5 yes Figure 1 A schematic diagram of another layer of the lid of the box;

[0041] Figure 6 This is a three-dimensional structural diagram of the honeycomb core layer provided in an embodiment of the present invention.

[0042] Figure label:

[0043] 100. Box lid; 1. Cover plate; 11. Main body plate; 111. Main body section; 112. Corner section; 113. Reinforcing rib; 1131. First reinforcing rib; 1132. Second reinforcing rib; 12. Side plate; 121. First part; 122. Second part; 101. Honeycomb core layer; 102. First structural layer; 103. Second structural layer; 104. First fireproof layer; 105. Electromagnetic shielding layer; 106. Second fireproof layer; 2. Eaves board. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0045] Please see Figures 1 to 3In some embodiments of this application, the box cover 100 includes a cover plate 1, the cover plate 1 includes a honeycomb core layer 101, a first structural layer 102 and a second structural layer 103, the first structural layer 102 and the second structural layer 103 are respectively disposed on opposite sides of the honeycomb core layer 101; wherein, the first structural layer 102 includes a non-metallic matrix reinforced composite material layer; and / or, the second structural layer 103 includes a non-metallic matrix reinforced composite material layer.

[0046] In the technical solution of this application, the cover plate 1 of the box cover 100 is composed of a honeycomb core layer 101 and a first structural layer 102 and a second structural layer 103 disposed on both sides thereon, forming a sandwich structure. The first structural layer 102 and the second structural layer 103 serve as the surface layer of the sandwich structure, and at least one of them includes a non-metallic matrix reinforced composite material layer, which has the characteristics of high strength and lightweight, mainly used to withstand in-plane tensile, compressive, and shear loads, and bears the main bending moment in the overall structure. The honeycomb core layer 101 located in the middle has a high porosity, which not only significantly reduces the overall weight of the box cover 100, but also possesses excellent bending stiffness and lateral shear bearing capacity. Through the above structural design, while achieving lightweighting of the box cover 100, the bending stiffness and torsional performance are improved, taking into account structural strength requirements, thereby improving its structural safety and performance.

[0047] It should be further noted that the honeycomb core layer 101 is not limited to traditional honeycomb core materials composed of hexagonal structural units (such as...). Figure 6 As shown in the figure, in some embodiments, its structural form can be adjusted according to actual needs. For example, the cavity structure in the honeycomb core layer 101 can be a regular or irregular shape such as a triangle, quadrilateral, pentagon, heptagon or a combination of polygons, as long as it can provide sufficient support stiffness and lightweight effect, and is suitable for combining with the first structural layer 102 and the second structural layer 103 to form a sandwich structure.

[0048] Please see Figures 3 to 5 In some embodiments, the cover plate 1 further includes a first fireproof layer 104, which is disposed on the side of the first structural layer 102 opposite to the honeycomb core layer 101. In these embodiments, by providing the first fireproof layer 104 on the cover 100, its fire resistance performance can be effectively improved. Under extreme operating conditions, it can provide good isolation and barrier against flames and high temperatures, thereby enhancing the safety protection capability of the battery pack. The first fireproof layer 104 is located on the side of the first structural layer opposite to the honeycomb core layer 101, which does not affect the mechanical properties and lightweight design of the sandwich structure. While ensuring the strength and weight reduction effect of the cover 100, it further improves its reliability in potentially fire-prone environments.

[0049] Please see Figure 3In some embodiments, the cover plate 1 further includes an electromagnetic shielding layer 105, which is disposed between the first fireproof layer 104 and the first structural layer 102. In these embodiments, the electromagnetic shielding layer 105 disposed between the first fireproof layer 104 and the first structural layer 102 can effectively suppress electromagnetic interference (EMI) generated during the operation of the high-voltage system inside the battery pack, preventing it from affecting external electronic devices, thereby improving the electromagnetic compatibility of the battery system and ensuring the stable operation of the vehicle's electrical system. Since the electromagnetic shielding layer 105 is disposed between the first fireproof layer 104 and the first structural layer 102, that is, on the side of the first structural layer 102 opposite to the honeycomb core layer 101, it does not affect the mechanical properties and lightweight design of the sandwich structure. Therefore, it does not affect the original bending stiffness, torsional performance, and lightweight advantages of the cover 100, ensuring that the structural function is not affected. In addition, the electromagnetic shielding layer 105 is located inside the first fireproof layer 104. In practical applications, it is physically covered and thermally protected by the first fireproof layer 104, preventing it from being directly exposed to the external environment. This improves the durability of the electromagnetic shielding layer 105 and its stability under extreme working conditions, further enhancing the overall safety and service life of the cover 100.

[0050] Please see Figures 3 to 5 In some embodiments, the cover plate 1 further includes a second fireproof layer 106, which is disposed on the side of the second structural layer 103 opposite to the honeycomb core layer 101. In these embodiments, by providing the second fireproof layer 106 on the cover 100, its fire resistance performance can be effectively improved. Under extreme operating conditions, it can provide good isolation and barrier against flames and high temperatures, thereby enhancing the safety protection capability of the battery pack. The second fireproof layer 106 is located on the side of the second structural layer opposite to the honeycomb core layer 101, which does not affect the mechanical properties and lightweight design of the sandwich structure. While ensuring the strength and weight reduction effect of the cover 100, it further improves its reliability in potentially fire-prone environments.

[0051] Please see Figures 3 to 5In some embodiments, the cover plate 1 further includes a first fireproof layer 104 and a second fireproof layer 106. The first fireproof layer 104 is disposed on the side of the first structural layer 102 opposite to the honeycomb core layer 101, and the second fireproof layer 106 is disposed on the side of the second structural layer 103 opposite to the honeycomb core layer 101. In these embodiments, by disposing the first fireproof layer 104 and the second fireproof layer 106 on the outer sides of the first structural layer 102 and the second structural layer 103 respectively, a double-layer fireproof system is constructed, which can effectively block possible flames and high temperatures from different directions. Whether thermal runaway occurs inside the battery pack or an external fire source intrudes, the double-layer fireproof design can provide a more comprehensive protective barrier, significantly improving the thermal safety and fire resistance of the battery system. Both fireproof layers are disposed on the outer side of the sandwich structure composed of the honeycomb core layer 101 and the first structural layer 102 and the second structural layer 103, without affecting the mechanical properties and lightweight design inside the sandwich structure, and therefore will not affect the original bending stiffness, torsional performance, and lightweight advantages of the cover 100. While ensuring structural strength, it also achieves functional expansion, significantly improving the safety and reliability of the battery pack in extreme fire environments.

[0052] Please see Figure 4 In some embodiments, the cover plate 1 further includes an electromagnetic shielding layer 105, which is disposed between the second fireproof layer 106 and the second structural layer 103. In these embodiments, the electromagnetic shielding layer 105 is disposed between the second fireproof layer 106 and the second structural layer 103. The electromagnetic shielding layer 105 can effectively suppress electromagnetic interference (EMI) generated during the operation of the high-voltage system inside the battery pack, preventing it from affecting external electronic equipment, thereby improving the electromagnetic compatibility of the battery system and ensuring the stable operation of the vehicle's electrical system. Since the electromagnetic shielding layer 105 is disposed between the second fireproof layer 106 and the second structural layer 103, that is, on the side of the second structural layer 103 opposite to the honeycomb core layer 101, it does not affect the mechanical properties and lightweight design inside the sandwich structure. Therefore, it does not affect the original bending stiffness, torsional performance, and lightweight advantages of the cover 100, ensuring that the structural function is not affected. In addition, the electromagnetic shielding layer 105 is located inside the second fireproof layer 106. In practical applications, it is physically covered and thermally protected by the second fireproof layer 106, preventing it from being directly exposed to the external environment. This improves the durability of the electromagnetic shielding layer 105 and its stability under extreme working conditions, further enhancing the overall safety and service life of the cover 100.

[0053] Please see Figure 5In some embodiments, the cover 1 further includes an electromagnetic shielding layer 105, which is disposed on the side of the second fireproof layer 106 facing away from the second structural layer 103. The electromagnetic shielding layer 105 faces the battery module. In these embodiments, by placing the conductive electromagnetic shielding layer 105 in the innermost layer of the cover 100, it facilitates direct contact or close contact with the CCS (Cell Connection System) in the battery module. This electromagnetic shielding layer 105 can not only effectively suppress electromagnetic interference generated during the operation of the high-voltage system inside the battery pack and improve the electromagnetic compatibility of the system, but also serve as a reliable current-carrying path in the event of leakage, quickly guiding the leakage current to the grounding network (such as the metal structure of the enclosure or the vehicle grounding system), thereby preventing leakage current accumulation or conduction through unexpected paths. This design effectively reduces the risk of electric shock to personnel and equipment damage, enabling the electromagnetic shielding layer 105 to simultaneously possess the dual functions of electromagnetic protection and safe grounding, significantly improving the electrical safety and reliability of the battery pack.

[0054] In some embodiments, the cover 1 further includes a phase change material (not shown in the figure), which is disposed in the cavity structure of the honeycomb core layer 101. In these embodiments, by introducing a phase change material inside the honeycomb core layer 101, heat can be absorbed or released during battery pack operation, effectively buffering local temperature fluctuations and thus improving the thermal management capability of the cover 100. This design utilizes the cavity structure of the honeycomb core layer 101 itself as a receiving space, achieving the integration of lightweight and thermal control functions without increasing the structural volume. It enhances the thermal stability of the battery system without compromising the original mechanical properties, helps to slow down the propagation speed of thermal runaway, and improves the overall safety and service life of the battery pack.

[0055] In some embodiments, the cover plate 1 further includes an encapsulation shell that encapsulates the phase change material to form phase change material microcapsules (not shown in the figure), which are disposed within the cavity structure of the honeycomb core layer 101. In these embodiments, by encapsulating the phase change material into a microcapsule structure, leakage or migration during use can be effectively prevented, improving the material's stability and long-term reliability. Simultaneously, the microcapsule form facilitates its uniform distribution within the cavity structure of the honeycomb core layer 101, enabling a more efficient and controllable heat absorption and release process. This design not only retains the lightweight and high-strength characteristics of the cover plate 100's sandwich structure but also further enhances its thermal response capability and functional integration level, improving the thermal management performance of the battery system under complex operating conditions.

[0056] This application does not limit the specific type of non-metallic matrix reinforced composite material layer, as long as it meets the lightweight and structural strength requirements of the lid 100. In some embodiments, the non-metallic matrix reinforced composite material includes high-performance synthetic fiber composite materials, which use high-strength, high-modulus artificial synthetic fibers (such as aramid fibers, ultra-high molecular weight polyethylene fibers, polyimide fibers, etc.) as reinforcement and are combined with a suitable resin matrix. In other embodiments, the non-metallic matrix reinforced composite material includes thermoplastic composite materials. These materials use thermoplastic resins (such as polypropylene, polyamide, polyetheretherketone, etc.) as the matrix and are reinforced by adding fibers (such as glass fibers, carbon fibers, or natural fibers). In still other embodiments, the non-metallic matrix reinforced composite material includes bio-based resin composite materials. These materials use naturally derived polymers (such as starch, cellulose, chitosan, soy protein, etc.) as the matrix and are reinforced by adding natural fibers or other reinforcements (such as wood fibers, bamboo fibers, hemp fibers, etc.).

[0057] In some embodiments, the non-metallic matrix reinforced composite material layer includes a resin-based continuous fiber reinforced composite material layer. In these embodiments, the non-metallic matrix reinforced composite material includes a resin-based continuous fiber reinforced composite material. Using such composite materials as the first structural layer 102 and / or the second structural layer 103 can significantly improve the specific strength and specific stiffness of the cover 100, meeting its requirements for withstanding mechanical loads during vehicle operation. Resin-based continuous fiber reinforced composite materials possess excellent fatigue resistance, corrosion resistance, and designability, which helps extend the service life of the cover 100 and simplify the manufacturing process. Furthermore, this type of material is easily integrated with the honeycomb core layer 101, further improving structural integrity and production efficiency, providing a reliable structural solution for the battery pack that combines lightweight, high strength, and environmental adaptability.

[0058] In some examples, the continuous fiber reinforced composite material contains at least one of glass fiber, carbon fiber, and aramid fiber, with a fiber volume fraction of 40%-70%, and the resin matrix is ​​a thermosetting resin, including at least one of epoxy resin, phenolic resin, and vinyl ester resin.

[0059] This application does not limit the material of the first fireproof layer 104 and / or the second fireproof layer 106. For example, it can be an inorganic fireproof coating, an intumescent fireproof material, a fiberglass cloth composite fireproof layer, etc.

[0060] In some embodiments, the first fireproof layer 104 and / or the second fireproof layer 106 are made of ceramicized silicone. This material has good flexibility and sealing properties at room temperature, and can undergo ceramicization transformation at high temperature to form a dense ceramic layer, which effectively blocks heat and flame propagation, thereby significantly improving the fire safety of the battery pack under extreme conditions such as thermal runaway.

[0061] This application does not limit the specific configuration of the electromagnetic shielding layer 105, such as the use of conductive coating, metal foil layer, conductive tape, conductive fabric, etc.

[0062] In some embodiments, the electromagnetic shielding layer 105 is a conductive fiber mesh, which is woven or arranged from conductive fibers such as silver-plated fibers, carbon fibers, or metal-coated fibers. This structure has good conductivity and flexibility, can effectively suppress electromagnetic interference generated during the operation of the battery system, improve the electromagnetic compatibility performance of the system, and facilitates integration with other functional layers of the cover 100.

[0063] Secondly, embodiments of this utility model provide a housing assembly, including a housing body and a cover 100; the housing body has an opening, and the cover 100 is disposed on the opening to define, together with the housing body, a mounting cavity for mounting a battery module. The structure of the cover 100 is as described above. Since this housing assembly adopts all the technical solutions of all the above embodiments, it at least has the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0064] Please see Figure 1 and Figure 2 In some embodiments, the cover plate 1 includes a main plate 11 and a side plate 12. The main plate 11 is disposed on the side of the box body with an opening and is spaced apart from the box body. The side plate 12 is bent and connected to the periphery of the main plate 11. The box cover 100 also includes an eaves plate 2, which is bent and connected to the end of the side plate 12 away from the main plate 11 and extends towards the center away from the main plate 11. The end of the eaves plate 2 away from the side plate 12 is connected to the box body to close the opening. In these embodiments, the main plate 11, the side plate 12, and the eaves plate 2 form a three-dimensional structure, which improves the overall rigidity of the box cover 100 and enhances the connection stability between it and the box body. The design of the eaves plate 2 not only provides a good edge sealing effect but also effectively transfers external loads to the box body, improving the structural integrity and deformation resistance of the entire shell assembly.

[0065] Please see Figure 1In some embodiments, the side panel 12 includes a first portion 121 and a second portion 122 that are bent and connected; the main body panel 11 includes a main body portion 111 and a corner portion 112, with a portion of the periphery of the corner portion 112 connecting the first portion 121 and the first portion 121, and a portion of the periphery of the corner portion 112 connecting the main body portion 111, and the thickness of the corner portion 112 being greater than the thickness of the main body portion 111. In these embodiments, without significantly increasing the overall weight, the structural strength and stiffness of the corner portion 112 region are enhanced, especially when subjected to external impact or vibration loads, effectively avoiding deformation or cracking problems caused by local stress concentration. In addition, the thickened corner portion 112 structure provides a more stable foundation for the connection between the side panel 12 and the main body panel 11, improving the structural integrity and fatigue resistance of the entire cover 100.

[0066] Please see Figure 1 and Figure 2 In some embodiments, the main body plate 11 has a partial protrusion on one side facing the housing to form a reinforcing rib 113. In these embodiments, by providing the reinforcing rib 113 on the inner side of the main body plate 11, its bending stiffness and load-bearing capacity can be significantly improved without changing the external contour. This structural design helps to disperse the local pressure exerted by the battery module on the housing cover 100, preventing deformation or failure caused by uneven stress.

[0067] Please see Figure 1 and Figure 2 In some examples, the main body plate 11 has a partial convexity on the side facing the box, and correspondingly, a partial concaveness on the side facing away from the box, achieving structural reinforcement without changing the overall thickness of the main body plate 11. This corresponding concave-convex arrangement improves material utilization efficiency and further enhances structural performance on the basis of lightweight design.

[0068] Please see Figure 1 In some embodiments, the reinforcing rib 113 includes a first reinforcing rib 1131 and a second reinforcing rib 1132, the extension directions of the first reinforcing rib 1131 and the second reinforcing rib 1132 intersecting. In these embodiments, the intersecting extension directions of the first reinforcing rib 1131 and the second reinforcing rib 1132, through the use of a cross-arranged reinforcing rib structure, enable effective transmission and distribution of multi-directional loads, significantly improving the torsional and bending resistance of the main body plate 11 under complex working conditions. This design not only improves the mechanical properties of the cover 100 but also helps to suppress buckling deformation caused by localized stress concentration, thereby enhancing the structural stability and long-term reliability of the battery pack under dynamic load environments such as vibration and impact.

[0069] Please see Figure 1In some embodiments, the first reinforcing rib 1131 extends to the periphery of the main body plate 11 at both ends; the second reinforcing rib 1132 extends to the periphery of the main body plate 11 at one end. In these embodiments, by extending the reinforcing rib 113 to the edge of the main body plate 11, the mechanical load received in the middle can be more effectively transferred to the edge area of ​​the cover 100, and ultimately transmitted to the side plate 12 and the box structure, thereby achieving continuity of the load path and uniformity of structural response. This design helps to improve the overall stiffness consistency of the cover 100, reduce the probability of local weak areas, and further enhance the structural integrity and fatigue life of the shell assembly under dynamic loads.

[0070] Thirdly, embodiments of this utility model provide a battery pack, including a housing assembly and a battery module. The structure of the housing assembly is as described above, and the battery module is installed in the mounting cavity. Since this battery pack adopts all the technical solutions of the above embodiments, it at least possesses the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0071] Fourthly, embodiments of this utility model provide an electrical device, which includes a battery pack, the structure of which is as described above. Since this electrical device employs all the technical solutions of the above embodiments, it at least possesses the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon further here.

[0072] Electrical equipment can be vehicles, energy storage power supplies, consumer electronics, medical equipment, or smart cities, etc., and this disclosure does not make any specific limitations.

[0073] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A box lid, characterized in that, Includes a cover plate, the cover plate comprising: Honeycomb core layer; A first structural layer and a second structural layer are respectively disposed on opposite sides of the honeycomb core layer; Wherein, the first structural layer includes a non-metallic matrix reinforced composite material layer; and / or, the second structural layer includes a non-metallic matrix reinforced composite material layer.

2. The lid according to claim 1, characterized in that, The cover plate also includes a first fireproof layer, which is disposed on the side of the first structural layer opposite to the honeycomb core layer.

3. The lid according to claim 2, characterized in that, The cover plate also includes an electromagnetic shielding layer, which is disposed between the first fireproof layer and the first structural layer.

4. The lid according to claim 1 or 2, characterized in that, The cover plate also includes a second fireproof layer, which is disposed on the side of the second structural layer opposite to the honeycomb core layer.

5. The lid according to claim 4, characterized in that, The cover plate also includes an electromagnetic shielding layer. The electromagnetic shielding layer is disposed between the second fireproof layer and the second structural layer; or... The electromagnetic shielding layer is disposed on the side of the second fireproof layer away from the second structural layer, and the electromagnetic shielding layer is directed toward the battery module.

6. The lid according to claim 1, characterized in that, The cover plate also includes a phase change material, which is disposed in the cavity structure of the honeycomb core layer.

7. The lid according to claim 6, characterized in that, The cover plate also includes an encapsulation shell, which encapsulates the phase change material to form phase change material microcapsules, which are disposed in the cavity structure of the honeycomb core layer.

8. The lid according to claim 1, characterized in that, The non-metallic reinforced composite material layer includes a resin-based continuous fiber reinforced composite material layer.

9. A housing assembly, characterized in that, include: The box has an opening; The cover as described in any one of claims 1 to 8, wherein the cover is disposed over the opening to define, together with the housing, a mounting cavity for mounting the battery module.

10. The housing assembly according to claim 9, characterized in that, The cover plate includes a main plate and a side plate. The main plate is disposed on the side of the box body where the opening is provided and is spaced apart from the box body. The side plate is bent and connected to the periphery of the main plate. The lid also includes an eaves panel, which is bent and connected to the side panel at the end away from the main body panel and extends toward the center away from the main body panel. The end of the eaves panel away from the side panel is connected to the box body to close the opening.

11. The housing assembly according to claim 10, characterized in that, The side plate includes a first part and a second part that are bent and connected. The main body plate includes a main body portion and a corner portion. A portion of the periphery of the corner portion is connected to the first part and the first part, and a portion of the periphery of the corner portion is connected to the main body portion. The thickness of the corner portion is greater than the thickness of the main body portion.

12. The housing assembly according to claim 10, characterized in that, The main plate has a partial protrusion on one side facing the box to form a reinforcing rib.

13. The housing assembly according to claim 12, characterized in that, The reinforcing ribs include a first reinforcing rib and a second reinforcing rib, and the extension directions of the first reinforcing rib and the second reinforcing rib intersect.

14. The housing assembly according to claim 13, characterized in that, The two ends of the first reinforcing rib extend to the periphery of the main body plate, respectively; One end of the second reinforcing rib extends to the periphery of the main body plate.

15. A battery pack, characterized in that, include: The housing assembly as described in any one of claims 9 to 14; The battery module is installed in the mounting cavity.

16. An electrical appliance, characterized in that, Includes the battery pack as described in claim 15.

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